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Graphics, interviews, food experiments and commentary shows the importance of soluble and insoluble dietary fibre in the diet, rich food sources, and its function in the body. A case study of breakfast show DJ Twin B illustrates how a breakfast rich in fibre (such as porridge) gives energy. The difference between soluble and insoluble fibre is explained, and the way each of these relates to the speed of movement through the digestive tract to prevent constipation and diarrhoea. An experiment shows the gas produced by bacteria in the colon.